linux-kernel - Re: [PATCH 04/09] memcg: make zone_reclaim

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Date:	Mon,  1 Dec 2008 09:50:05 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH 04/09] memcg: make zone_reclaim_stat

> KOSAKI Motohiro wrote:
> 
> > @@ -172,6 +173,10 @@ void activate_page(struct page *page)
> >  
> >  		reclaim_stat->recent_rotated[!!file]++;
> >  		reclaim_stat->recent_scanned[!!file]++;
> > +
> > +		memcg_reclaim_stat = mem_cgroup_get_reclaim_stat_by_page(page);
> > +		memcg_reclaim_stat->recent_rotated[!!file]++;
> > +		memcg_reclaim_stat->recent_scanned[!!file]++;
> 
> Also, manipulation of the zone based reclaim_stats happens
> under the lru lock.
> 
> What protects the memcg reclaim stat?

memcg zone and memcg zone_reclaim_stat also use zone->lru_lock.




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